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J. 11 DE NAVARRO. APPARATUS FOR GALGINING CEMENT.

Patented Jan. 1, 1895.

WiZnemow In: Mmms Ptrzm c0. morouma, wrwwnfox o c.

UNITED STATES PATENT @rricn.

JOSE F. DE NAVARRO, OF NEW YORK, N. Y., ASSIGNOR TO ALFONSO DE NAVARRO,OF SAME PLACE.

APPARATUS FOR CALCINING CEMENT.

SPECIFICATION forming part of Letters Patent No. 531,742, dated January1, 1895.

Application filed October 19, 1892. Renewed July 21, 1894. Serial No.518,286. l\To model.)

To ctZZ whom it may concern.-

Beit known that I, J osn F. on NAVARRO, a resident of the city of NewYork, in the county and State of New York, have invented a new anduseful Improvement in the Apparatus for Oalcining Cement, of which thefollowing is a specification, reference being had to the accompanyingdrawings.

In the manufacture of cement it has been found desirable to reduce thecement material before burning to a condition as nearly as possible tothat of fine powder in order that it may be most thoroughly burned, andhence that the cement obtained should be of uniform quality. The finerthe degree of pulverization, the better is the quality of the cementproduced, but an obstacle to the profitable burning of the finelypowdered material has been a great waste which has resulted from so muchof the powder being carried ofif to the chimney by the draft of thefurnace. I remedy this difficulty by moistening the powder thoroughly toa just sufficient degree to prevent it from flying with the draft yetnot sufficient to destroy its pulverulent condition, leaving all itsfine particles suificiently mobile with respect to each other to enablethem to be exposed in an infinitesimally divided condition to the heatof the furnace.

In order to moisten the powder thoroughly and to a proper degree, Iapply the moisture to the dry pulverulent material While it is beingstirred and while on its way to the furnace, and to this end myinvention consists in the combination of devices hereinafter describedand claimed.

Figure 1 in the accompanying drawings represents a vertical longitudinalsection. Fig. 2 represents a transverse sectional view in the line a; a:of Fig. 1.

Similar letters of reference designate corresponding parts in both thefigures.

A is the main cylinder of the furnace which may be constructed in themanner common to the cylinders of rotary furnaces, of p a cylindricalshell of iron with a fire-brick lining, the said cylinder being open atboth ends and having a longitudinal inclination. It is represented assupported and rotated upon rollers in the manner common to such furnacecylinders. The upper end of the cylinder communicates with the chamber Bfrom which ascends a chimney O. The lower end of the said cylindercommunicates with the chamber D through the outer wall of which isintroduced the heat for heating the interior of the cylinder, the heatin the example represented being supplied by the fuel gas introducedthrough said chamber by a pipe E. In a suitable position near the higherend of the cylinder is an elevated bin F from which the cement material,previously reduced to a powder and finely bolted, is supplied to theupper end of the cylinder by means of a screw conveyer G arranged underthe bin F to receive the powdered material therefrom and a conductor H Ito receive the powdered material from the conveyor G and conduct it intothe cylinder. The conductor H I consists of a hopper H, the spout I ofwhich enters into the outer end of the cylinder. A stirrer J is anranged at the outlet of the bin Fand a stirrer K is arranged in thethroat of the hopper to keep the material loose that it may be fedfreely.

Arranged above the conveyor G is a jet pipe L represented as consistingof a pipe arranged above and lengthwise of the screw-conveyor and finelyperforated. This pipe which may receive Water or steam from any suitablesource is furnished with a regulating valve a by which to regulate thequantity of water or steam delivered through its perforations so thatthe cement in its passage through the conveyor receiving numerous jetsof steam or water from said pipe may be moistened to the requireddegree. The water or steam being sprinkled or jetted upon the powderedmaterial while it is in motion in the conveyor and stirred by the screwthereof becomes very thoroughly distributed among the pewdered materialwhich therefore becomes uniformly moistened. The degree to which thismoistening is edected must be very carefully guarded so that it shallnot be sufficient to produce such great cohesiveness between theparticles of the material as to render them compact butshall leave thematerial in a loose crumbly or friable condition in which it passesthrough the conductor into the upper end of the cylinder and in whichcondition it remains as it passes through the cylinder in the burningprocess. This condition, while it is such that it will not be carriedback by the draft of the chimney, is such that all its result which hasbeen long aimed at in the manufacture of cement and numerous experimentsshow that such a thorough and uniform moistening of the cement when Veryfinely ground can only be effected at a point near Where it enters thefurnace and while it is in constant agitation on its way thereto.

What I'claim as my invention, and desire to secure byLetters Patent, is-

1. The combination with a furnace and a feeding apparatus for feedingpulverized cement material thereto, of means for moistening the saidmaterial while in said feeding apparatus on its Way to thefurnace,substantially as herein set forth.

2. The combination with a furnace, of a screw conveyer for conveyingtoward said furnace the material to be burned therein and stirring thesaid material during its conveyance, and a jet pipe for moistening saidmaterial in the conveyor while undergoing the stirring operation thereinon its way to the furnace, substantially as herein set forth.

JOSE F. DE NAVARRO.

